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Heat-pump water heaters Updated: 12 May 2009

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Econergy - price include tank? Posted by: David Pauley 23 Dec 2011 7:19am

I assume that the econergy unit price mentioned ($4300) does not include the water tank, unlike the intergrated models. Are you able to clarify?

thanks
David

HWHP/Wetback Posted by: confused! 18 Aug 2011 1:17pm

Can you have a mains pressure hotwater cylinder heated by a heatpump and have the cylinder also connected to a wetback woodburner?

if you choose to use HWHP for hot water, a heat pump for an indoor lap pool and a heat pump to heat a house can any of these be connected?

thanks

AquaFire Systems Posted by: Linda Montgomery 19 Mar 2011 7:33pm

Just wondering if anyone has any info or experience of the Aquafire systems www.aquafire.co.nz, particularly in the south (we are in Wanaka, Central Otago)

Heating a pool Posted by: Suzanne Becher 03 Feb 2011 11:37pm

I wonder if any of the units you tested are suitable for heating a pool. If the econergy heats water to a fixed temperature of 60C it is clearly not suitable. How about the others?

Gas vs HWHP Posted by: Douglas Mein 21 Sep 2010 9:59am

You write "A good heat-pump water heater (HPWH) would reduce your hot-water bill by two-thirds" .

I assume this is compared to other electric water heating.

What is the running cost compared to gas?

Thanks

Douglas

new news? Posted by: Katrina Monaghan 05 Jul 2010 1:26am

Is there any more news about the Japanese CO2 pumps? This could be an amazing breakthrough for NZ. The article may also need updating, as there are two new HWHPs listed for sale on trademe in my region, one for $3,500, the other for only $3,000. At these prices, it seems like a really good option for heavy users like me.

As for the minimum safe temperature for hot water, I thought that that was well established. A breakthrough (and very simple) technology to save more energy would be to set the hot water to lower temperatures than the currently recommended 60 degrees, but with a timer causing the water to be super-heated periodically to kill any legionaires bacteria.

Noise rating a big factor Posted by: On-to-it 15 Feb 2010 3:19pm

...there is at least a 10dB difference between some heat pumps, and this makes a big difference with these things running at night. No buying decision should ignore noise as it is an expensive problem to manage.

Mains pressure? Posted by: Jayson Speer 31 Jul 2009 10:28pm

I cannot find anywhere in this article about whether the Ecoenergy can be connected to a Mains pressure hot water cylinder. I am assuming it can, but can you confirm this?
Also, as per Thomas Schneider's request, can you pls provide websites for the suppliers of each product.

Cheers :-)